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Maintenance
HC-10 NEXSTAR
Rope Replacement
No precise rules can be given for determination of the exact time for replacement of rope, since many
variable factors are involved.
Replacement rope shall have a strength rating at least as great as the original
rope furnished or recommended by Auto Crane. A rope manufacturer, Auto
Crane, or a qualified person shall specify any deviation from the original size,
grade, or construction.
Conditions such as the following shall be reason for questioning continued use of the rope or increasing
the frequency of inspection:
1. In running ropes, six randomly distributed broken wires in one strand in one lay.
2. One outer wire broken at the contact point with the core of the rope structure and protrudes or loops
out of the rope structure. Additional inspection of this section is required.
3. Wear of one third of the original diameter of the outside individual wire.
4. Kinking, crushing, bird caging, or any other damage resulting in distortion of the rope structure.
5. Evidence of any heat damage from any cause.
6. Reduction of nominal diameter of more than:
A. 1/64” (0.4mm) – for diameters up to and including 5/16” (8mm)
B. 1/32” (0.8mm) – for diameters 3/8” (9.5mm) through and including 1/2” (13mm)
C. 3/64” (1.2mm) – for diameters 9/16” (14.5mm) through and including 3/4” (19mm)
D. 1/16” (1.6mm) – for diameters 7/8” (22mm) through and including 1-1/8” (29mm)
E. 3/32” (2.4mm) – for diameters 1-1/4” (32mm) through and including 1-1/2” (38mm)
7. In standing ropes, more than two broken wires in one lay in sections beyond end connections or more
than one broken wire at an end connection.
Rope Installation and Maintenance
8. Rope should be stored to prevent damage and deterioration.
1. Unreeling or uncoiling of rope shall be done as recommended by the rope manufacturer and with care
to avoid kinking or inducing twist.
2. Before cutting a rope, seizing shall be placed on each of the place where the rope is to be cut to
prevent unlaying of the strands. On preformed rope, one seizing on each side of the cut is required.
On non-preformed ropes of 7/8” (22mm) or smaller, two seizings on each side of the cut are required.
For non-preformed rope 1 in. (25mm) diameter or larger, three seizings on each side of the cut are
required.
3. During installation care should be exercised to avoid dragging of the rope in the dirt or around objects
that will scrape, nick, crush, or induce sharp bends in it.
4. Rope should be maintained in a well-lubricated condition. It is important that lubricant applied as a
part of the maintenance program shall be compatible with the original lubricant, and to this end the
rope manufacturer should be consulted. Lubricant applied shall be the type that does not hinder visual
inspection. Those sections of rope that are located over sheaves or otherwise hidden during inspection
and maintenance procedures require special attention when lubricating rope. The object of rope
lubrication is to reduce internal friction and to prevent corrosion.
5.
When an operating rope shows greater wear or well-defined localized areas than on the remainder of
the rope, rope life can be extended in some cases by shifting the wear to different areas of the rope.
NOTICE